Choke



Patented Dec.` 5, 1933 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to chokes for pipe lines of oil wells and has for the primary object, the provision of a device of the above stated character whereby discarded o r worn chokes may be again 5 utilized and employed as a shell for a core for retarding the flow of oil and gas and which is capable of providing satisfactory service over a much longer period of time than obtainable by the conventional type of choke and which is capable of resisting the wear from sand, salt water and other chemicals contained within the oil, consequently reducing to a minimum the cost of maintaining effective chokes in the oil line.

Another object of this invention is the provision of a novel mounting for the core in the shell wherein the pressure in the oil and gas thereon will aid in establishing a leak-proof connection between the core and the shell.

Another object of this invention is the provision of means whereby a person or the operator will be warned when the core has become worn to such an extent that replacement should be made for further successful operation of the device.

A further object of this invention is the provision of a choke of the above stated character which will be simple, durable and efficient and which may be manufactured and sold at a comparatively low cost. ,Y

With these and other objects in view, this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing, in which Figure l is a side elevation partly in section illustrating a choke connected in the oil line of an oil well and constructed in accordance with my invention.

Figure 2 is an enlarged vertical sectional View illustrating the same.

f Figure 3 is a transverse sectional view taken on the line 3-3 of Figure 2.

Figure 4 is a view similar to Figure 2 showing the shell constructed from glass.

Figure 5 is an end view illustrating the form of choke shown in Figure 4.

50 Figure 6 is a vertical sectional view illustrating a slight modification of the bore of the shell. Figure 7 is a sectional View taken on the line 7-'7 of Figure 6.

i' Referring in detail to the drawing, the numeral.

1 indicates the tubing of an oil well having an oil line` 2 connected thereto by a choke 3 con-y structed in accordance with my invention. The conventional type of choke 3 now in use within oil Wells consists of a metallic body having each end screw threaded and provided with a restricted bore therethrough and due to the passage of sand, salt water and other chemicals within the oil and gas, the choke soon becomes worn to such an extent that the removal thereof is necessitated.. With my invention I utilize the worn or discarded chokes to form a shell 4 and bored or otherwise formed therethrough a tapered bore 5 to receive a tapered core' 6 that projects beyond each end of the shell 4 to provide exposed ends which are secured to the shell by cement as shown at 'l 70 to prevent seepage of oil and gas between the shell and the core. The shell is drilled or bored to form a bore 8 of the desired diameter for the purpose of providing a choke to the iiow` of oil. The core-6 is constructed from either hardened 75 steel as shown in Figures l and 2 or from glass as shown in Figures 4 and 6 of the oiiicial drawing. From actual experience it has been found that the core constructed from glass will last for a longer period of time than cores constructed from hardened steel.

By the bore 5 of the shell 4 and the `outer wall of the core 6 being tapered, the pressure of the oil and gas thereon will have a tendency to wedge the core within the shell and thereby aid in es- 35 tablishing a leak-proof connection between these parts.

An annular groove 9 is formed in the wall of the bore 5 of the shell 4 and has in communication therewith a passage 10 extending through 90 the outer face of the shell. The core is provided with a plurality of relatively spaced and annularly arranged sockets 11 in the outer face of the core 6 which are in communication with the ari-J4 nular 'groove 9. As the core wears from use, the sockets 11 will become in communication with the bore of the core thereby permitting a small amount of oil to escape through the passage 10 of the shell 4 thereby indicating to the operator that the core is worn to such an extent that the replacement thereof is necessary for further successful operation of the device.

As shown in Figure 6, the discharge end of the core may be flared as at 12 to facilitate the escape of the oil and gas from the device.

While I have shown and described the preferred embodiment of my invention, it will be understood that minor changes in construction, combination and arrangement of parts may be made with- 110 1M out departing from the spirit and scope o! my mounted in the bore and having the ends thereinvention, as claimed.

Having thus described my invention, what I emm is:

A choke i'or oil well lines comprising a shell and having a bore tapering from one end to its opposite end, a, core tapering throughout its length of projecting outwardly of the shell, cement securing the extended ends of the core to the ends of the shell and cooperating with the tapers of the core and shell in preventing seepage of iluid between the core and shell.

JAMES HERBERT ALEXANDER. 

